Noncollinear antiferromagnetic structure of the molecule-based magnet Mn[N(CN){sub 2}]{sub 2}

Journal Article · Fri Sep 01 00:00:00 EDT 2000 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.62.5576· OSTI ID:20217476

Kmety, Carmen R ^[1]; Huang, Qingzhen ^[2]; Lynn, Jeffrey W ^[2]; Erwin, Ross W ^[2]; Manson, Jamie L ^[3]; McCall, S ^[4]; Crow, J E ^[4]; Stevenson, Kenneth L ^[5]; Miller, Joel S ^[3]; Epstein, Arthur J ^[1]

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1. Department of Physics, The Ohio State University, Columbus, Ohio 43210-1106 (United States)
2. NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
3. Department of Chemistry, University of Utah, Salt Lake City, Utah 84112-0850 (United States)
4. National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310 (United States)
5. Department of Chemistry, Indiana University Purdue University, Fort Wayne, Indiana 46805 (United States)

The crystallographic and magnetic properties of the Mn[N(CN){sub 2}]{sub 2} compound have been investigated by dc magnetization, ac susceptibility, specific heat, and zero-field neutron diffraction on polycrystalline samples. The magnetic structure consists of two sublattices which are antiferromagnetically coupled and spontaneously canted. The spin orientation is mainly along the a axis with a small uncompensated moment along the b axis. The ground state is a crystal-field sextet with large magnetic anisotropy. The crystal structure consists of discrete octahedra which are axially elongated and successively tilted in the ab plane. Comparisons of the magnetic structures for the isostructural M[N(CN){sub 2}]{sub 2} (M=Mn, Fe, Co, Ni) series suggest that the spin direction is stabilized by crystal fields and the spin canting is induced by the successive tilting of the octahedra. We propose that the superexchange interaction is the mechanism responsible for the magnetic ordering in these compounds and we find that a crossover from noncollinear antiferromagnetism to collinear ferromagnetism occurs for a superexchange angle of {alpha}{sub c}=142.0(5) degree sign . (c) 2000 The American Physical Society.

• OSTI ID: 20217476
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 62, Issue 9; Other Information: PBD: 1 Sep 2000; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANTIFERROMAGNETIC MATERIALS
ANTIFERROMAGNETISM
CRYSTAL STRUCTURE
MAGNETIC PROPERTIES
MAGNETIZATION
MAGNETIC SUSCEPTIBILITY
SPECIFIC HEAT
NEUTRON DIFFRACTION
ANISOTROPY
CRYSTAL FIELD
EXCHANGE INTERACTIONS
NITROGEN COMPOUNDS
CYANOGEN
MANGANESE COMPOUNDS
IRON COMPOUNDS
COBALT COMPOUNDS
NICKEL COMPOUNDS
COPPER COMPOUNDS
EXPERIMENTAL DATA
THEORETICAL DATA